I’m working on a fictional scifi fantasy novel that takes place in the real world one of my characters is a giantess, or just shy of it by four inches and she’s very muscular… a warrior type character. I don’t want to paint a picture of a character too encumbered by weight and stature to move about freely.
The character is about seven feet tall I guess the proper terminology would be a human female with gigantisism.

how tall is she and if she’s 50 ft. to 100 ft. about 1 ton
I’d go with like 20 tons. Depending on how tall it was. I mean dinosaurs weigh more than that and they were giants.
A good rule of thumb is that when you double the size, you quadruple the weight. So, If a normal size woman is 5 ft and 120lbs, then a 7 ft woman would be about 300lbs.